This is a classic issue with 1st time builds. The spokes to each flange are fine but aren't phased or sequenced correctly to match the other flange.
Numbering the spokes in the rim in sequence the even spokes go to one flange and the odd to the other, (or right/left/right...etc..). In the hub the sequence is similar, with the spokes alternating right, left back and forth across the hub.
Place a spoke or sight across the hub and where two adjacent and almost parallel spokes, ie. the circled one and it's mate to the left, and follow them down to the hub. The left spoke should go to a hole 1/2 holes to the LEFT of the one that the spoke to the right goes to. I'll venture that it doesn't.
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